/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.gaia.metrics;



import com.bff.gaia.unified.runners.core.metrics.MetricsContainerImpl;

import com.bff.gaia.unified.runners.gaia.GaiaPipelineOptions;

import com.bff.gaia.unified.sdk.io.Source;

import com.bff.gaia.unified.sdk.metrics.MetricsEnvironment;

import com.bff.gaia.unified.sdk.options.PipelineOptions;



import java.io.Closeable;

import java.io.IOException;



/**

 * Util for invoking {@link Source.Reader} methods that might require a {@link MetricsContainerImpl}

 * to be active. Source.Reader decorator which registers {@link MetricsContainerImpl}. It update

 * metrics to Gaia metric and accumulator in start and advance.

 */

public class ReaderInvocationUtil<OutputT, ReaderT extends Source.Reader<OutputT>> {



  private final String stepName;

  private final GaiaMetricContainer container;

  private final Boolean enableMetrics;



  public ReaderInvocationUtil(

      String stepName, PipelineOptions options, GaiaMetricContainer container) {

    GaiaPipelineOptions gaiaPipelineOptions = options.as(GaiaPipelineOptions.class);

    this.stepName = stepName;

    enableMetrics = gaiaPipelineOptions.getEnableMetrics();

    this.container = container;

  }



  public boolean invokeStart(ReaderT reader) throws IOException {

    if (enableMetrics) {

      try (Closeable ignored =

          MetricsEnvironment.scopedMetricsContainer(container.getMetricsContainer(stepName))) {

        boolean result = reader.start();

        container.updateMetrics(stepName);

        return result;

      }

    } else {

      return reader.start();

    }

  }



  public boolean invokeAdvance(ReaderT reader) throws IOException {

    if (enableMetrics) {

      try (Closeable ignored =

          MetricsEnvironment.scopedMetricsContainer(container.getMetricsContainer(stepName))) {

        boolean result = reader.advance();

        container.updateMetrics(stepName);

        return result;

      }

    } else {

      return reader.advance();

    }

  }

}